// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

// Depends on jshint.js from https://github.com/jshint/jshint

(function (mod) {
    if (typeof exports == "object" && typeof module == "object") // CommonJS
        mod(require("../../lib/codemirror"));
    else if (typeof define == "function" && define.amd) // AMD
        define(["../../lib/codemirror"], mod);
    else // Plain browser env
        mod(CodeMirror);
})(function (CodeMirror) {
    "use strict";

    // declare global: JSHINT

    function validator(text, options) {
        if (!window.JSHINT) {
            if (window.console) {
                window.console.error("Error: window.JSHINT not defined, CodeMirror JavaScript linting cannot run.");
            }
            return [];
        }
        if (!options.indent) // JSHint error.character actually is a column index, this fixes underlining on lines using tabs for indentation
            options.indent = 1; // JSHint default value is 4
        JSHINT(text, options, options.globals);
        var errors = JSHINT.data().errors, result = [];
        if (errors) parseErrors(errors, result);
        return result;
    }

    CodeMirror.registerHelper("lint", "javascript", validator);

    function parseErrors(errors, output) {
        for (var i = 0; i < errors.length; i++) {
            var error = errors[i];
            if (error) {
                if (error.line <= 0) {
                    if (window.console) {
                        window.console.warn("Cannot display JSHint error (invalid line " + error.line + ")", error);
                    }
                    continue;
                }

                var start = error.character - 1, end = start + 1;
                if (error.evidence) {
                    var index = error.evidence.substring(start).search(/.\b/);
                    if (index > -1) {
                        end += index;
                    }
                }

                // Convert to format expected by validation service
                var hint = {
                    message: error.reason,
                    severity: error.code ? (error.code.startsWith('W') ? "warning" : "error") : "error",
                    from: CodeMirror.Pos(error.line - 1, start),
                    to: CodeMirror.Pos(error.line - 1, end)
                };

                output.push(hint);
            }
        }
    }
});